Here’s a look at the cheapest postal service options for packages and how fast they are expected to arrive: For USPS, flat rate boxes may be the best value since they can contain up to 70 pounds ...

With rates stating at $10.10 for Flat Rate Envelopes, $10.65, for USPS Flat Rate Mailing Box, and $9.35 when using your own box by weight/zone Priority Mail Express up 3.2%, basic fee is $31.40 ...